walmartsustainable Wal-Mart, which helped promote the adoption of those funny-looking "green" lightbulbs, is making more room in its Sam's Club warehouse stores for environmentally friendly products -- including a water-saving toilet that has one button for flushing liquids and another for flushing solids.

Employees at a Sam's Club in the discounter's home town in Bentonville, Arkansas, have emptied shelves of things like power tools to make way for a variety of green products. Similar efforts have taken place in Sam's Clubs across the United States.

"Our members need and are looking for things that will help them mitigate their energy bills," said Joel Heiligenthal, buyer of home efficiency products at the club store chain.

 Wal-Mart launched its own private-label compact fluorescent lightbulbs (CFLs) in 2007 and has been selling them in thousands of stores.  

As part of an environmental push started under former CEO Lee Scott, Wal-Mart also has outlined plans to one day be supplied by 100 percent renewable energy.